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172 pages, Hardcover
First published January 1, 1859
The only proof capable of being given that an object is visible, is that people actually see it. The only proof that a sound is audible, is that people hear it: and so of the other sources of our experience. ... [The] sole evidence it is possible to produce that anything is desirable, is that people do actually desire it. ... No reason can be given why the general happiness is desirable, except that each person, so far as he believes it to be attainable, desires his own happiness.